Not really a conflict book, But Amanda Ripley's "Unthinkable" focuses on people's actions during crises. Why some freeze, panic, run, or rise to the occasion.

I have yet to read them, but Dave Grossman's "On Combat" and "On Killing" examine the psychological costs and coping mechanisms of conflict.
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Hope for the best and prepare for the worst.

The object in life is not to be on the side of the majority, but to escape finding oneself in the ranks of the insane